27 January 2010 Chrominance watermark for mobile applications
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Abstract
Creating an imperceptible watermark which can be read by a broad range of cell phone cameras is a difficult problem. The problems are caused by the inherently low resolution and noise levels of typical cell phone cameras. The quality limitations of these devices compared to a typical digital camera are caused by the small size of the cell phone and cost trade-offs made by the manufacturer. In order to achieve this, a low resolution watermark is required which can be resolved by a typical cell phone camera. The visibility of a traditional luminance watermark was too great at this lower resolution, so a chrominance watermark was developed. The chrominance watermark takes advantage of the relatively low sensitivity of the human visual system to chrominance changes. This enables a chrominance watermark to be inserted into an image which is imperceptible to the human eye but can be read using a typical cell phone camera. Sample images will be presented showing images with a very low visibility which can be easily read by a typical cell phone camera.
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Alastair Reed, Alastair Reed, Eliot Rogers, Eliot Rogers, Dan James, Dan James, } "Chrominance watermark for mobile applications", Proc. SPIE 7542, Multimedia on Mobile Devices 2010, 75420V (27 January 2010); doi: 10.1117/12.839134; https://doi.org/10.1117/12.839134
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